docs(user): add user stories

[svedziok]

Added user stories with links to guides for guiding users.

Summary by Sourcery

Documentation:

• Introduce a new user stories document to guide researchers and service/data providers in accessing and managing cloud services and data.

[sourcery-ai]

Reviewer's Guide by Sourcery

This PR adds documentation for user stories that describe different scenarios for accessing cloud services and data through LifeScience AAI. The changes include adding a new markdown file with detailed user stories and updating the navigation configuration to include the new document.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Added new documentation for user stories	Created comprehensive user stories for researchers and service providers Added scenarios for service access and authentication Included stories about data access and control Added workflow analysis scenarios Provided links to relevant guides and tutorials	docs/guides/user_stories.md
Updated navigation configuration	Added new user stories document to the navigation menu under Guides section	mkdocs.yml

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[sourcery-ai]

Hey @svedziok - I've reviewed your changes - here's some feedback:

Overall Comments:

• There's a mismatch between the filename in mkdocs.yml ('guides/user-stories.md') and the actual file ('guides/user_stories.md'). Please update one to match the other.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟡 Documentation: 2 issues found

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